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Algul Siento was a base created by slow_dive that many 2b2t oldfags based at, including Spikain, Branillon, kinorana, linkgonzo, and others. It was griefed by IMBJR so slow_dive could leave the server, and he has not played since.
Gallery
Overhead view of the base
Another view that shows the floating glass sphere
An End portal frame placed on the balcony of a house
A later screenshot of the same house, showing multiple dragon eggs stacked on top of the End portal frame